Write a regular expression
Let's write some regular expressions!
Your task is to create a regular expression matching a valid temperature represented either in Celsius or Fahrenheit scale (e.g. '+23.5 C', '-4 F', '0.0 C', '73.45 F') and to extract all the appearances from the given string text. Positive temperatures can be with or without the + prefix (e.g. '5 F', '+5 F'). Negative temperatures must be prefixed with -. Zero temperature can be used with a prefix or without.
The re module is already imported.
Tips:
- The
+symbol within the square brackets[]matches the+symbol itself (e.g. the regular expression[1a+]matches to'1','a', or'+'). - You can also apply
?to the characters within the square brackets[]to make the set optional (e.g.[ab]?matches to'a','b', or'').
This exercise is part of the course
Practicing Coding Interview Questions in Python
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Define a pattern to search for valid temperatures in text
pattern = re.compile(____)
# Print the temperatures out
print(re.findall(pattern, text))